Leviathan for sure. The view of Sea World from across the broad-water is genuinely exciting again, and I think it'll be both a real fun ride while also being incredibly unique.
Big Dipper is also going to be exciting in it's own way. So many folks (myself included) have suggested for years that something like a Raptor-style coaster would absolutely kill it at LPS, so to have that dream turn into reality is pretty awesome too.
Steel Taipan... there's so many pros and cons to this project that I feel like Homer with the Frogurt...
Dreamworld finally getting it's first genuinely great full circuit coaster! Yay! But it replaces an entire themed land with (based off the tender files on Parkz) arguably meh theming and no real concious long-term view of how that will integrate into the rest of the park's flow management (let alone how it integrates with Buzzsaw). Yikes! But, people say these Blue Fire clones kick arse! Yay! But, with the triple launch feature, they're not shortening the now un-necessarily long launch section, which really mucks up the pacing of the ride as a whole. Yikes! But, we're finally getting something comparable to Rivals! Yay! But, will it be too similar in the public's eyes? And is it too little too late, and has there been to much closed and SBNO that the penny may drop come December that the coaster is simply not enough to turn Ardent's fortunes around and have they finally burnt out the last remaining goodwill they had with the public? Yikes!